iOS Question [SOLVED] GeoFence and closed app

[Mike1970]

Hi everyone.
I was wondering if it's possibile to set up a geofence that when you enter (or exit), triggers an event catchable with the app closed.
(like Apple "Find My" app, that can send a notification to you when a friend leave/arrive a place).
I'm not knowledge about this things , so I'm trying to discover new useful functionality

 

[josejad]

Have you check this?

Geofence - Monitoring a region

This example extends iLocation library to allow monitoring regions in the background. The code is pretty simple. You first need to create a circular region which you want to track and then call MonitorRegion to start tracking it. The RegionEnter / RegionExit events will be raised, even if the...

www.b4x.com

 

[Mike1970]

Yeah is the example I want to begin from, but it work with the app open.
My thought was if there is a way to catch the event when the app is totally closed

 

[Erel]

Geofence should work even if the app is not in the foreground. Carefully go over the tutorial.

 

[Mike1970]

Geofence should work even if the app is not in the foreground. Carefully go over the tutorial.

Yeah now I try to do all the tests

 

[Mike1970]

Ok I compiled the app in release, then I went out to test it.

1 test: app open , when I exit/enter the region it notify

2 test: app in background. Works

3 test: app CLOSED, when I enter/exit the region it notify, but execute all the script of appplication_start.

But I don’t know why when I tested to exit the region when the app was closed it said “exit” and after a second “enter” even if I was in the same place

 

[Sandman]

But I don’t know why when I tested to exit the region when the app was closed it said “exit” and after a second “enter” even if I was in the same place

Positioning isn't an exact science. And if you were just on the border, it's entirely possible that you could get that result. If I remember correctly, the OS determines the position using cell phone towers and wifi stations for all ambient positioning in the background. It probably (other forum members might know more about this) only activates the GPS when it really has to, such as when an app is in the foreground and requests an exact position (and the user allows it). The GPS is very expensive, batterywise, so the OS tries hard to minimize its' use. So, imagine how crude the position could be using just towers and wifi - and that could explain what happened to you.

 

[Mike1970]

Positioning isn't an exact science. And if you were just on the border, it's entirely possible that you could get that result. If I remember correctly, the OS determines the position using cell phone towers and wifi stations for all ambient positioning in the background. It probably (other forum members might know more about this) only activates the GPS when it really has to, such as when an app is in the foreground and requests an exact position (and the user allows it). The GPS is very expensive, batterywise, so the OS tries hard to minimize its' use. So, imagine how crude the position could be using just towers and wifi - and that could explain what happened to you.

it could be. however this is a minimal problem filtrable in someway I imagine, that i will think in the future!

Thanks for the tip